@Landy
96 to 06 there was no UK growth at all (probably due to the generational change). There has been more steady growth between 06 and now.
But notice how the population rises from 1996 to 2006 - very roughly 1.6 million but from 2006 to 2016 - a whopping - 6.4 million. I believe this reflects the great influx of folk from eastern Europe having joined the EU and been granted free movement - especially from Poland - who make up a sizeable portion of recent jw's today in the UK.
Growth? It's as flat as a pancake really.